Coil winding device



June 26, 1951 v MARTILLA 2,558,621

COIL WINDING DEVICE Filed April 5, 1948" Patented June 26, 1951 UNITED STATES PATENT OFFICE COIL WINDING DEVICE Frank H. Martilla, Minneapolis, Minn.

Application April. 5, 1948, Serial No. 19,009

1 Claim.- (Cl. 140-92.2)

My invention relates to coil-winding devices and, more particularly, to adjustable coil-winding mandrels for use in winding field coils for electric motors and the like.

The primary object of my device is the provision of a structure of the type above-described, upon which concentric coils of substantially the same thickness but of varying circumference may produce two complete setsof coils adapted to be nested in concentric relation.

A still further object of my invention is the provision of a device of the class described which is inexpensive to produce, rugged in construction, and simple to operate.

The. above and still further objectsof my ill-- vention will become apparent from. the following detailed specification, appended claim, and attached drawings.

Referring to the drawings, wherein like characters indicate like parts throughout the several views: I

Fig. l is a plan of my coil-windingdevice, some parts being broken. away and some parts being shown in section;

Fig. 2 is a view in side elevation;

Fig. 3 is a view, partly in end elevation and partly in section, taken on. the line 33 of Fig. 1; and

Fig. 4 is a view in end elevation seen looking from the right to the left with respect to Fig. 1.

Referring, with greater particularity to the drawings, the numeral l indicates a head, preferablyform-ed from steel or like material and shown as being in the nature of an elongated bar. Projecting axially outwardly from the central portion of the head I is a socket 2 adapted to receive therein the end of a rotary spindle 3 which may be locked therein by means of a set screw or the like 4. The rotary spindle 3 may be attached to a lathe or other means for rotating the same, not shown. On its face opposite the socket 2, the head I is provided with a'longitudinally-extended outwardly-opening dove 2 tailed guideway 5, the center of which intersects the axis of rotation of the head I. A pair of tongue-shaped slides 6 and l are slidably mounted in the guideway 5. Each of the slides 6' and l are provided with legs 8 which project through aligned diametrically-opposed slots 9 in the head I and have their free outer ends internally threaded, one with aright-hand thread and the other" with a left-hand thread to receive opposite threaded ends of a reversely threaded stud or screw Ill. The screw [0' is journalled' intermediate its ends inthe base portion of the socket 2 and is maintained against axial movements therein by means of stop collars i I. It will be noted that the legs 8 may be formed integrally with the slides 6 and 7 but preferably and as shown are rigidly secured thereto by means of machine screws or the like [2. One end of thescrew It is provided with a rectangular shank 13 to which a key or wrench may be applied for turning the same.

Secured to the slides 6 and l and projecting axially outwardly of the head I in opposite directions from the legs 8 are elongated supporting arms M and I5 respectively, which preferably and as shown are angular in cross section. The arms Hi and IE are diametrically-opposed with respect 7 to the axis of rotation of said head and extend outwardly therefrom inparallel relationship.

As shown, a plurality of pairs of matched cooperating'mandrel elements l8 are slidably mounted on each of said arms. Adjacent the head, the mandrel elements !6 abut against shoulders I! on the arms Hi and I5 respectively. A clamp comprises a pair of parallel bars [3; and a coopcrating. central clam-ping screw H 9 applied to the outer end portions of the arms l4 and [5 both limits the axially outward movements of the mandrel elements It and at the same time maintains the parallelism of the free ends of the arms [5- and I6. vided with a plurality of radially-projecting fins or partitions 25 which divide said elements into mandrel sections 2| which diiTer in peripheral dimensions in. a rising series of steps A, B, and C from the opposite ends of the elements I6 toward the centers thereof.

With reference to Figs. 2 and 4, it will be seen that each of the fins or partitions 20 is provided with a radially outwardly-opening notch 22 all of which notches 22, as shown in Fig. 2, lie in the same longitudinal plane. As shown in Fig. 1, one of the fins adjacent the abutting ends of the mandrel element It is elongated, as indicated at The mandrel elements l6 are pro- 23, for a purpose which will hereinafter become apparent.

As shown in Fig. l, the head i is provided with a linear scale 24 which extends radially outwardly from the center of rotation thereof along one side edge thereof. Adapted to cooperate with linear scale 24 is an indicating finger 25, which is rigidly secured to one of the arms (shown as being arm It).

When it is desired to utilize my novel structure, the adjustment stud I6 is turned to properly space the arms i4 and i5 and the cooperating mandrel elements i6 carried thereby to produce a series of coils of the desired diametrical or circum-.

ferential measurements. Thereafter, the clamptightened to rigidly maintain the free ends of the arms in a parallel relationship during the" winding of wire upon the'mandrels Hi. The head i is rotatively mounted to the rotary spindle 3, as indicated in Fig. 1. Wire to be coiled on the mandrel elements 16 may be started at either of the opposite ends thereof in one of the steps A. When the desired number of turns has been wound on the step A, rotation of the spindle is stopped or at least slowed down sumciently to allow the wire to be passed through the notch '22 leading to the adjacent step B and thereafter rotation is started or sped up as the case may be and the required number of turns wound thereon. Similarly, wire is passed through the notch 22 in the fin 29 between the step B and C and the process repeateduntil all of the mandrel sections on one of the pairs of mandrel elements 16 receive the desired number of turns of wire. Thereafter, the wire is passed through the notch 22 in the elongated fin 23 and the process repeated for the next pair of mandrel elements. When the two pairs of mandrel elements have received the required number of turns of Wire, rotation of the device is stopped, the coils are properly tied, the clamping bars 18 loosened from the outer ends of the arms 14 and i5, and the elements l6 slidabl removed therefrom. The elements 16 may be easily removed from the arms 14 and i5 if the adjustment screw 56 is rotated in a direction to bring the arms 14 and I5 toward one another. When the wire-covered mandrel elements 16 have been slidably removed from the arms I4 and I5, they may readily be moved toward one another, so as to permit their removal from the coils, thus leaving the coils of wire intact and ready for mounting in the stator of an alternating current motor. The arrangement illustrated provides a set ofstator coils for a four-pole alternating current motor. The coils of wire are applied to the stator of the motor in a well-known manner with coils wound on adjacent steps A, B, and C forming concentric coil elements in the stator. The added length of wire caused by the elongated fin or partition 23 between two of the sets of coils allows for the greater spacing between the smaller coils when installed in a motor stator. The linear scale 24 and the cooperating indicating finger 25 simplify the setting of the arms l4 and I5, whereby to provide an accurate interior periphery for the coils without the necessity of calipers or other measuring devices to ascertain such measurements.

When it is desired to wind a connected series of coils as above described for other than a fourpole motor, sufiicient pairs of mandrel elements are mounted on the arms M and B5 to provide the required number of coils. Hence, when it is desired to wind coils for a two-pole motor, it is only necessary to use but one pair of elements [6. On the other hand, when winding coils for a six-pole motor, three pairs of mandrel elements l6 are necessary.

My invention has'been found particularly advantageous, not only in the building of new motors, but in the rebuilding of worn-out motors, and has resulted in a substantial saving of time 1 and efiort' in the winding of field coils therefor;

and while I have disclosed a preferred embodiment of my invention as required by section 4838 Of the United States statutes, it will be understood that the same is capable of various modifications without departure from the spirit and scope of the invention as defined in the claim.

-What I claim is:

In a device of the class described, a rotary head, a pair of diametrically-opposed elongated supporting arms carried by said head and projecting axially therefrom in parallel relationship, screw means on said head for simultaneously moving said arms toward and away from each other, a pair of matching mandrel elements mounted one each on said arms and slidably removable from the free ends of said arms, means limiting movements of said mandrel elements on said arms axially of said head, said mandrel elements being divided longitudinally into a plurality of mandrel sections, said sections dilfering in peripheral dimensions in a rising series of steps from the ends of said sections toward the centers thereof, and a radially-extended fin between each of said steps and at the opposite ends of each of said elements, said fins being provided with outwardly-opening wire-receiving notches, one of the fins adjacent the abutting small ends of said mandrel sections extending radially outwardly a greater distance than any of the other of said fins.

FRANK H. MARTILLA.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,086,664 Havens Feb. 10, 1914 1,088,127 Clark Feb. 24, 1914 1,396,033 Francis Nov. 8, 1921 1,731,183 Thacker Oct. 8, 1929 1,945,195 Kellems Jan. 30, 1934 2,011,114 Papin Aug. 13, 1935 2,046,883 Robbins July 7, 1936 2,143,315 Hanson Jan. 10, 1939 2,261,200 Wilson Nov. 4, 1941 

